Convective suppression before and during the United States Northern Great Plains flash drought of 2017

Tobias Gerken, Gabriel T. Bromley, Benjamin L. Ruddell, Skylar Williams, Paul C. Stoy

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Flash droughts tend to be disproportionately destructive because they intensify rapidly and are difficult to prepare for. We demonstrate that the 2017 US Northern Great Plains (NGP) flash drought was preceded by a breakdown of land-atmosphere coupling. Severe drought conditions in the NGP were first identified by drought monitors in late May 2017 and rapidly progressed to exceptional drought in July. The likelihood of convective precipitation in May 2017 in northeastern Montana, however, resembled that of a typical August when rain is unlikely. Based on the lower tropospheric humidity index (HIlow), convective rain was suppressed by the atmosphere on nearly 50% of days during March in NE Montana and central North Dakota, compared to 30% during a normal year. Micrometeorological variables, including potential evapotranspiration (ETp), were neither anomalously high nor low before the onset of drought. Incorporating convective likelihood to drought forecasts would have noted that convective precipitation in the NGP was anomalously unlikely during the early growing season of 2017. It may therefore be useful to do so in regions that rely on convective precipitation.

Original languageEnglish (US)
Pages (from-to)4155-4163
Number of pages9
JournalHydrology and Earth System Sciences
Volume22
Issue number8
DOIs
StatePublished - Aug 7 2018

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Earth and Planetary Sciences (miscellaneous)

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